My advice is somewhat two-fold.
1) Don’t be afraid to enlist help in whatever form is best for you. If this means a professional to take the reins and handle everything, that’s great. If this means your best friend to provide comical relief and take the pressure off of you, it works just as well. Just know there are a lot of moving pieces and help is a welcome thing.
2) Remember the big picture. Don’t let the little things get in the way of your enjoyment of the overall event, whether it be a fundraiser, tailgate, engagement or wedding. There may be small snags here and there, keep your sights on the goals of the event so that you have no regrets after.